I plumbed in a new sump for my 180 gallon FOWLR yesterday and I am having some plumbing issues that I'm working through, so there wasn't a skimmer or filtration running for most of yesterday. But I did have my 2 MP40s running for flow the entire time. This morning I wake up and everyone is alive but they all seems really stressed out. At first I count it up to be because of everything yesterday and I feed them like normal, everyone eats decently so I go about my day watching the sump levels to get them regulated. My wife and I leave to get lunch and run an errand, but when we return about 2 1/2 hours later, 2 of my chromis are dead and my purple tang has all these white splotches all over him. Everyone is breathing really really heavy and idk what to do. I'm in the process of running a 50% water change incase something got in there. Does anyone have any advise? I really dont want to loose all of my stock.